diff options
Diffstat (limited to 'sys/dev/syscons/syscons.c')
| -rw-r--r-- | sys/dev/syscons/syscons.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c index 6d08400..2601c4e 100644 --- a/sys/dev/syscons/syscons.c +++ b/sys/dev/syscons/syscons.c @@ -839,14 +839,20 @@ scioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) case VT_SETMODE: /* set screen switcher mode */ { struct vt_mode *mode; + struct proc *p1; mode = (struct vt_mode *)data; DPRINTF(5, ("sc%d: VT_SETMODE ", sc->unit)); if (scp->smode.mode == VT_PROCESS) { - if (scp->proc == pfind(scp->pid) && scp->proc != p) { + p1 = pfind(scp->pid); + if (scp->proc == p1 && scp->proc != p) { + if (p1) + PROC_UNLOCK(p1); DPRINTF(5, ("error EPERM\n")); return EPERM; } + if (p1) + PROC_UNLOCK(p1); } s = spltty(); if (mode->mode == VT_AUTO) { @@ -2067,6 +2073,7 @@ int sc_switch_scr(sc_softc_t *sc, u_int next_scr) { struct tty *tp; + struct proc *p; int s; DPRINTF(5, ("sc0: sc_switch_scr() %d ", next_scr + 1)); @@ -2086,7 +2093,10 @@ sc_switch_scr(sc_softc_t *sc, u_int next_scr) if (sc->switch_in_progress && (sc->cur_scp->smode.mode == VT_PROCESS) && sc->cur_scp->proc) { - if (sc->cur_scp->proc != pfind(sc->cur_scp->pid)) { + p = pfind(sc->cur_scp->pid); + if (sc->cur_scp->proc != p) { + if (p) + PROC_UNLOCK(p); /* * The controlling process has died!!. Do some clean up. * NOTE:`cur_scp->proc' and `cur_scp->smode.mode' @@ -2119,6 +2129,8 @@ sc_switch_scr(sc_softc_t *sc, u_int next_scr) DPRINTF(5, ("waiting nothing, ")); } } else { + if (p) + PROC_UNLOCK(p); /* * The controlling process is alive, but not responding... * It is either buggy or it may be just taking time. @@ -2283,8 +2295,12 @@ do_switch_scr(sc_softc_t *sc, int s) static int vt_proc_alive(scr_stat *scp) { + struct proc *p; + if (scp->proc) { - if (scp->proc == pfind(scp->pid)) + if ((p = pfind(scp->pid)) != NULL) + PROC_UNLOCK(p); + if (scp->proc == p) return TRUE; scp->proc = NULL; scp->smode.mode = VT_AUTO; |
